(;GM[1]FF[4]SZ[19]
GN[second ko]
PC[http://senseis.xmp.net/?GokyoShumyoSection3Problem18/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection3Problem18/Attempts

second ko]
PL[B]

AB[da][cb][hb][dc][ec][fc][gc]
AW[ba][bb][ib][cc][hc][ic][kc][bd][dd][gd][ee]

;B[ga]C[B1]MN[1]
;W[fb]C[W2]MN[2]
;B[eb]C[B3]MN[3]
;W[ca]C[W4]MN[4]
;B[fa]C[B5]MN[5]

;
)
